from across california to canada, thousands come to safin the wines of santa clara county. it's known to one type of unwelcome visitor and this wine owe owner is worried about. >> so far it's not so many and let's hope it doesn't turn into a huge problem. >> reporter: he is talking about the grapevine moth, first found in napa county a year-ago and since then spread to seven other counties, including santa clara. the grapevine moth is new to santa clara county. department of agriculture confirmed that they found three of the pests in a trap at one of the county's vineyards. they can be difficult to spot and snuff out and that is because the moth's larvae can grow inside the grape. >> if the larvae were inside of it, how would you be able to find it? it would be darned, almost impossible. >> reporter: thomas kruse has grown grape at his gilroy vineyard for the past decades and he is glad that authorities have announced the start of a eregard an eradication program. >>. >> reporter: we tried to reach santa clara county's agricultural director and county biologist to ask about